Electricity: motive power systems – Motor-reversing
Patent
1997-03-25
1998-11-24
Wysocki, Jonathan
Electricity: motive power systems
Motor-reversing
318466, H02P 300
Patent
active
058412530
ABSTRACT:
A garage door opening and closing apparatus having improved operational safety is disclosed. The apparatus includes a control circuit which responds to a number of input stimuli to generate commands to open and close a garage door as well as to stop garage door movement. Three relays respond to the commands via drive circuitry to actually connect door operating voltages to the windings of a door controlling motor. By redundancies in the operation of the three relays, faults in the operation of those relays result in safe door operating conditions. Additionally, the control circuitry upon issuing a door stop command, performs a test to determine whether or not the door is still moving. If the door is still moving, door up commands are generated by the control circuitry to place the door in a safe position.
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patent: 4338553 (1982-07-01), Scott, Jr.
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patent: 4393342 (1983-07-01), Matsuoka et al.
patent: 4464651 (1984-08-01), Duhame
Fitzgibbon James J.
Willmott Colin B.
The Chamberlain Group, Inc.
Wysocki Jonathan
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